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Dean Joseph Leffelman, Business Attorney in Lisle, Illinois

Over 46 years of legal practice · focused on Business, Estate Planning, and General · 5.0/5 rating from 1 verified client review

Of CounselatClingen Callow & McLean, LLC

Lisle, IL

Practicing business in Lisle since 1980.

46+
Years practicing
5.0 ★
1 client review
2
Bar admissions

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Quick answer

Dean Joseph Leffelman is an of counsel based in Lisle, IL. The practice focuses on Business, Estate Planning, and General. Dean has over 46 years of legal experience. Currently practicing at Clingen Callow & McLean, LLC. Rated 5.0 out of 5 from 1 client review.

Based in
Lisle, IL
Experience
over 46 years
Known for
Business · Estate Planning · General
  • Handles Business, Estate Planning, and General matters from Lisle, IL.
  • Over 46 years of practice as a licensed attorney.
  • Recognized with AV Preeminent.

About Dean Joseph Leffelman: Dean Joseph Leffelman is an of counsel based in Lisle, IL. The practice focuses on Business, Estate Planning, and General. Dean has over 46 years of legal experience. Currently practicing at Clingen Callow & McLean, LLC. Rated 5.0 out of 5 from 1 client review.

Areas of practice

Practice areas handled by Dean Joseph Leffelman

Dean concentrates on business, estate planning, general, m&a, and real estate. Each area below outlines the kind of case Dean handles, typical outcomes to expect, and how the intake process starts.

Business cases in Lisle, Illinois

Dean takes business matters in Lisle, Illinois. Typical engagements include intake calls to scope the issue, review of any records or filings you already have, and a written strategy memo before Dean agrees to represent you.

Estate Planning cases in Lisle, Illinois

Dean takes estate planning matters in Lisle, Illinois. Typical engagements include intake calls to scope the issue, review of any records or filings you already have, and a written strategy memo before Dean agrees to represent you.

General cases in Lisle, Illinois

Dean takes general matters in Lisle, Illinois. Typical engagements include intake calls to scope the issue, review of any records or filings you already have, and a written strategy memo before Dean agrees to represent you.

M&A cases in Lisle, Illinois

Dean takes m&a matters in Lisle, Illinois. Typical engagements include intake calls to scope the issue, review of any records or filings you already have, and a written strategy memo before Dean agrees to represent you.

Real Estate cases in Lisle, Illinois

Dean takes real estate matters in Lisle, Illinois. Typical engagements include intake calls to scope the issue, review of any records or filings you already have, and a written strategy memo before Dean agrees to represent you.

Biography

About Dean Joseph Leffelman — Over 46 years of Illinois business experience

Dean Joseph Leffelman is an of counsel based in Lisle, IL. The practice focuses on Business, Estate Planning, and General. Dean has over 46 years of legal experience. Currently practicing at Clingen Callow & McLean, LLC. Rated 5.0 out of 5 from 1 client review.

Dean Joseph Leffelman is a lawyer practicing corporate governance, mergers and acquisitions, private equity and 4 other areas of law. Dean received a B.S. degree from Northern Illinois University in 1976, and has been licensed for 46 years. Dean practices at Clingen Callow & McLean, LLC in Lisle, IL.

Dean's approach to business cases

Dean Joseph Leffelman is a lawyer practicing corporate governance, mergers and acquisitions, private equity and 4 other areas of law. Dean received a B.S. degree from Northern Illinois University in 1976, and has been licensed for 46 years. Dean practices at Clingen Callow & McLean, LLC in Lisle, IL.

Clients Dean works with

Dean reviews new inquiries case-by-case for business, estate planning, and general matters in Lisle and the surrounding Illinois area.

Credentials

Dean Joseph Leffelman's legal education and bar admissions

  • John Marshall Law School

    J.D. · 1979

  • Northern Illinois University

    B.S. · 1976

Jurisdictions

Dean's state bar admissions

  • U.S. District Court,

    1980 · ACTIVE

  • Illinois

    1980 · ACTIVE

Dean studied at J.D. in John Marshall Law School and B.S. in Northern Illinois University.

Law school and academic background

Dean completed J.D. in John Marshall Law School and B.S. in Northern Illinois University. Formal legal training is one signal of substantive knowledge — the day-to-day practice Dean runs in Illinois is where that training gets applied to real client questions.

Recognition

Awards, publications, and recognition of Dean Joseph Leffelman

Dean has received 1 formal recognition from bar associations, industry bodies, and peer-review services.

  • AV Preeminent

Legal awards and honors

AV Preeminent.

Affiliations

Dean's professional memberships and bar associations

  • DuPage County and Illinois State Bar Associations

    membership

Locations

Dean Joseph Leffelman's office in Lisle

Dean's primary office is at 2300 Cabot Dr., Ste. 500, Lisle, IL, 60532. In-person meetings are by appointment; a phone intake usually comes first.

Main office

Clingen Callow & McLean, LLC

2300 Cabot Dr., Ste. 500

Lisle, IL 60532

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Client feedback

Client reviews of Dean Joseph Leffelman — 5.0/5 rating from 1 verified client review

Every review below is from a verified client of Dean. Reviews cover communication, case outcome, and value — the three signals that matter most when comparing business attorneys in Lisle.

5.0

1 client review

Client ratings are sourced from public records and editorial research. Reviews on LawyersListed are accepted from verified clients once Dean Joseph Leffelman claims this profile.

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Hiring guide

How to hire Dean Joseph Leffelman — what to expect in your first consultation

Working with a new business attorney should feel structured. Here's how the first two conversations with Dean usually go, from the moment you request a consult to the day representation begins.

Consultation formats and pricing

Dean charges for the initial consult. That fee is credited toward representation if you retain Dean's office.

What to bring to your first meeting

Bring any documents you already have — police reports, medical records, filed pleadings, correspondence from an insurer, a copy of the contract at issue. If you're not sure, err on the side of bringing everything; Dean will tell you what matters and what doesn't.

Questions to ask a business attorney in Lisle, Illinois

A short list to run through before you commit: How many business matters have you handled in the last year? What's your fee structure? Who else in the office will work on this? What's your realistic estimate of timeline and range of outcomes? How do I reach you between meetings?

Fees & payment

Fees, payment methods, and consultation options for Dean

Dean discusses fees during intake so the arrangement fits the matter. Contingency, hourly, and flat-fee options are all common in business practice — ask which fits.

Hourly rates, contingency fees, and flat-fee options

Every business matter is priced differently. Simple document review might be a flat fee. Injury litigation is often contingency. Complex commercial disputes usually run hourly with a retainer. Dean confirms the model in the engagement letter before any work starts.

Payment methods and payment plans

Dean's office accepts standard payment methods. Ask about payment plans if the retainer is a stretch — many business practices work with clients on structured schedules.

Frequently asked

Frequently asked questions about Dean Joseph Leffelman

  • How much does it cost to hire Dean for a business case?

    Cost depends on the type of matter, the fee model (contingency, flat, hourly), and how contested the case becomes. Dean walks through the likely range during the consult so there are no surprises.

  • Does Dean offer a free consultation?

    Dean charges for the initial consult; that fee is credited toward representation if you retain Dean's office. Some business attorneys offer free consults — check Dean's current terms during booking.

  • How long do business cases in Illinois typically take?

    Simple business matters can wrap in a few weeks; disputed cases can run 6–18 months from intake to resolution, longer if the matter goes to trial. Dean gives a realistic estimate for your facts at the consult — vague answers here are a red flag.

  • Can Dean take my case if I'm outside Lisle?

    Dean is licensed in Illinois. Matters governed by Illinois law are the natural fit. Out-of-state matters are handled case-by-case, sometimes with local co-counsel. Ask during intake — Dean will tell you if the case is a fit or refer you to someone closer to your court.

  • What should I bring to my first meeting with Dean?

    Bring every document that touches the dispute: contracts, correspondence, police or medical reports, filed pleadings, invoices, photographs, insurance letters. Also bring a written timeline of what happened, in your own words. Dean will filter what matters — over-preparing at intake is always cheaper than needing a second meeting.

  • Is Dean accepting new business clients right now?

    Dean's intake status shifts week to week. Submit the form; the office will confirm availability or refer the matter out.

Areas served

Business attorneys serving Lisle, Chicago and Springfield in Illinois

Dean handles business matters throughout Illinois. Each city below is a direct link into the search page for verified business attorneys in that community.

More counsel

If Dean's intake is full or the fit isn't right, these business attorneys in Lisle handle similar matters. Every profile below is verified and open to consultations.